When i install new ROM ( Primo v4 ), i want to flash the "boot.img". and i type fastboot flash boot boot.img on my cmd. but i still on " < waiting for device > . anyone help me ??? please !!! i will give you many THANKS !!!

When i install new ROM ( Primo v4 ), i want to flash the "boot.img". and i type fastboot flash boot boot.img on my cmd. but i still on " < waiting for device > . anyone help me ??? please !!! i will give you many THANKS !!!

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